I remain skeptical of the provenance. The handwriting expert states the signature within is "highly probable". Okay, butthatdoesn't mean it is. Plus, if you have ever written on something like a grip vs a flat sheet of paper, the appearance of the writing will appear different. Also, I think a larger writing sample would be necessary to prove this was truly written by Jesse James.
Conveniently, a packet if pertinent information is missing.
I'm not buying it. Shaky provenance at best. In order to spend that kind of money, I need definitive proof, such as a document detailing this revolver, as written in Jesse James' time, with serial number or other unique identifying feature.